Portrait of Moritz Reiss in uniform taken by the Imperial photographer; Vienna Portraits Men

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Otto Gersuny on horseback in uniform as a physician for the Austro-Hungarian army.

Otto Gersuny graduated with a degree in medicine from the University of Vienna in June 1914. He attributed his being a doctor to his survival of World War I.

Studio portrait of unidentified soldier in military uniform; Darmstadt Portraits Men

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Fini Loewenthal with Justin Loewenthal in uniform; Regensburg Portraits Men

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Herman Sommerfeld (center) with other reserve soldiers in military uniform Portraits Men

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Herman Sommerfeld (center) with other soldiers in military uniform Portraits Men

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Herman Sommerfeld (right) in military uniform with an unidentified soldier Portraits Men

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Studio portrait of Herman Sommerfeld in military uniform Portraits Men

Handwritten on verso: Zur Erinnerung an meiner ? Zeit, Dein Hermann, Flughafen-Doberitz, Zum austuecken bereit

Studio portrait of Dr. Moritz Kroner in military uniform.

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Studio portrait of Dr. Moritz Kroner (center) with two unidentified men in military uniform.

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Portrait of Dr. William Levison in military uniform Portraits Men

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Studio portrait of Leopold Landsberger in military uniform, before the Verdun battle of World War I.

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Studio portrait of unidentified Levy brother (most likely Arthur or Hermann) in military uniform; Nogent-Sur-Seine, France.

Photographer's imprint lower left corner

Prediction of Breakdown Voltages of Binary Gas Mixtures in Uniform Electric Fields

A simple equation to predict the breakdown voltages for binary mixtures (Vmix) of electronegative gases (SF6, CCl2F2) and buffer gases (N2, N2O, CO2, air) under uniform electric field has been proposed. Values of Vmix evaluated using this equation for mixtures of SF6-N2, SF6-air, SF6-N2O, SF6-CO2 and CCl2F2-N2 over a wide range of pd show an excellent agreement with the experimentally measured data available in the literature.